Developing County Bridge Repair and Retrofit Techniques
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2013-08-01
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TRIS Online Accession Number:01516448
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Edition:FINAL REPORT
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Abstract:Oklahoma rated first in the Nation in the percentage of bridges that are structurally deficient or functionally obsolete. According to Federal Highway Administration data, Oklahoma uses approximately 23,250 bridges maintained by state, County, City, and Tribal governments. The Oklahoma Department of Transportation (ODOT) estimated that it would cost $3.4 billion to replace these bridges. The research team worked with engineers and bridge maintenance personnel from the ACCO, ODOT, and Oklahoma CED’s to identify, evaluate, and develop two repair techniques for deteriorating off system bridges. The project focused on repairing decayed timber piles and corroded H-piles. To repair decayed timber piles, the decayed pile was removed from the pile cap to sound wood below grade and then replaced with steel members that are commonly available to bridge maintenance personnel. These included steel pipe and steel H-pile sections. The corroded H-piles were repaired by welding steel plates to the flanges of H-piles containing corroded webs. The repair techniques were evaluated in the field through load testing strain gauge instrumented bridges. The steel H-pile repair was also investigated under controlled laboratory testing. The repairs were found to adequately restore strength and stiffness and transfer loads from the super structure to the foundation. Straight forward design guidelines and design tables were developed for each of the repair techniques. The recommended repairs are useful for extending the life of a bridge that contains decayed timber piles or steel H-piles with corroded webs. The repairs allow for adequate safety to be maintained while a deteriorating bridge is waiting to be replaced. This allows for county, tribal, and local government officials to prioritize and wisely spend their bridge and road maintenance resources.
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